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Java创建一个简单的图书管理系统
小编觉得挺不错的,现在分享给大家,帮大家做个参考.
由于暂时没有学过Java，写的乱七八糟
甚至连内部类和外部类都是写到一半才知道
不少地方还不清楚是为什么
package 图书管理系统
;
import java
.util
.Scanner
;
public class Library {final int book_kinds_number
= 5;final int students_number
= 5;final int password_length
= 4;final int max_borrow_number
= 2;public static void main(String
[] args
) {Book_Manage_System SWJTU_Library
= new Library().new Book_Manage_System(); Scanner input
= new Scanner(System
.in
);int sl_1
,sl_2
, log
= -1;boolean judge
= true;boolean judge_1
= true;boolean judge_2
= true;do {judge
= true;judge_1
= true;judge_2
= true;do {System
.out
.println("欢迎使用图书借阅系统"); System
.out
.println("登录...1\n离开...0");sl_1
= input
.nextInt();switch(sl_1
) {case 1: log
= SWJTU_Library
.Login();if(log
== -1) {System
.out
.println("密码输入错误\n");judge_1
= true;}else if(log
== -2) {System
.out
.println("用户名输入错误\n");}else {judge_1
= false;}break;case 0:System
.exit(0);default:System
.out
.print("输入有误，请重新输入");break;}}while(judge_1
);do {System
.out
.println("功能选择项"); System
.out
.println("查询馆内图书...1\n借阅图书...2\n归还图书...3\n退出登录...0");sl_2
= input
.nextInt();switch(sl_2
) {case 0:judge_2
= false;judge
= true; break;case 1:SWJTU_Library
.Show_All_Books();break;case 2:if(log
!= -1) {SWJTU_Library
.Borrow(SWJTU_Library
.students
[log
]);}break;case 3:SWJTU_Library
.Show_Student_Books(SWJTU_Library
.students
[log
]);SWJTU_Library
.Return(SWJTU_Library
.students
[log
]);break;default:judge_2
= false;break;}}while(judge_2
);}while(judge
);}public class Book {String name
;int num
;}public class Student{String name
;int borrow_number
;String password
; Book book
[] = new Book[max_borrow_number
];public void show_books(){int i
;for(i
=0;i
<max_borrow_number
;i
++) {if(book
[i
].num
>0) {System
.out
.print(book
[i
].name
);}if(i
!=max_borrow_number
- 1) {System
.out
.print("、");}}}Student(){ int i
;for(i
=0;i
<max_borrow_number
;i
++) {book
[i
] = new Book();book
[i
].num
= 0;book
[i
].name
= "";}}}public class Book_Manage_System{Book books
[] = new Book[5];Student students
[] = new Student[5];public int Login() {int i
, flag
= -2;Scanner input
= new Scanner(System
.in
);System
.out
.print("请输入用户名: ");String nm
= input
.nextLine();System
.out
.print("请输入密码");String key
= input
.nextLine();for(i
=0;i
<students_number
;i
++) {if(students
[i
].name
.equals(nm
)) {flag
= -1;if(students
[i
].password
.equals(key
)) {System
.out
.println("登录成功\n欢迎"+students
[i
].name
+"同学");flag
= i
;break;}}}return flag
;}public void Show_All_Books(){int i
;for(i
=0;i
<book_kinds_number
;i
++) {System
.out
.print(books
[i
].name
+" "+books
[i
].num
+"本\n");}}public void Borrow(Student stu
) {int i
,j
;for(i
=0;i
<book_kinds_number
;i
++) {System
.out
.println(books
[i
].name
+" 剩余"+books
[i
].num
);}System
.out
.println("请问要借哪本书？");Scanner input
= new Scanner(System
.in
);String bk
= input
.next();for(i
=0;i
<book_kinds_number
;i
++) {if(stu
.borrow_number
== max_borrow_number
) {System
.out
.println("您的借书数量已达上限");break;}if(books
[i
].name
.equals(bk
)) { if(books
[i
].num
==0) {System
.out
.println("此书已被借完");}else {System
.out
.println(stu
.name
+"借出一本《"+books
[i
].name
+"》");for(j
=0;j
<max_borrow_number
;j
++) {if(stu
.book
[j
].num
== 0) {stu
.book
[j
].name
= bk
;stu
.book
[j
].num
+= 1;break;}}books
[i
].num
-=1;stu
.borrow_number
+= 1;}break;}if(i
==book_kinds_number
-1) {System
.out
.println("图书馆里没有《"+bk
+"》这本书");}}}public void Show_Student_Books(Student stu
){int i
;for(i
=0;i
<max_borrow_number
;i
++) {if(stu
.book
[i
].num
>0) {System
.out
.println(stu
.book
[i
].name
+" "+stu
.book
[i
].num
);}}}public void Return(Student stu
){int i
,j
,flag
= 0;System
.out
.println("请问要还哪一本书?");Scanner input
= new Scanner(System
.in
);String rt
= input
.nextLine();for(i
=0;i
<max_borrow_number
;i
++) {if(stu
.book
[i
].name
.equals(rt
)) { stu
.book
[i
].name
="";stu
.book
[i
].num
-= 1;for(j
=0;j
<book_kinds_number
;j
++) {if(books
[j
].name
.equals(rt
)) {System
.out
.println("归还成功");books
[j
].num
+=1;break;}}flag
= 1;}}if(flag
== 0) {System
.out
.println("您没有这本书");}}Book_Manage_System() {books
[0] = new Book(); books
[1] = new Book();books
[2] = new Book();books
[3] = new Book();books
[4] = new Book();students
[0] = new Student();students
[1] = new Student();students
[2] = new Student();students
[3] = new Student();students
[4] = new Student();books
[0].name
= "高等数学";books
[0].num
= 2;books
[1].name
= "Java编程入门";books
[1].num
= 2;books
[2].name
= "漫游者日记";books
[2].num
= 2;books
[3].name
= "百武装战记";books
[3].num
= 2;books
[4].name
= "刀剑神域";books
[4].num
= 2;students
[0].name
= "无上辐光";students
[0].password
= "2337";students
[1].name
= "失败冠军";students
[1].password
= "2330";students
[2].name
= "空洞骑士";students
[2].password
= "1111";students
[3].name
= "艾米璐";students
[3].password
= "2222";students
[4].name
= "桐人";students
[4].password
= "3333";}}
}
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